#include <iostream>
//#include <cstring>

using namespace std;
void t1()
{
	char s[120];
	int a[5];
	int *ap;
	char *sp;
	cout << sizeof(s) << endl; 
	cout << sizeof(a) << endl; 
	cout << sizeof(ap) << endl; 
	cout << sizeof(sp) << endl; 
} 
void t2()
{
	char s[] = "Hell, World!";
	printf("%d\n",sizeof(s)-1);
	 
}
void t3()
{
	int n = 1;
	int end = 5;
	int sum = 0;
	int i=1;
	while (1)
	{
		sum += 1/i;
		if (sum>=5)
		{
			n = i;
			break;
		}		
		i++;		
	}
	printf("%d\n",n);
}
int main()
{
	t3();

	return 0;
}
